Airtac SAIJ50 Adjustable Cylinder SAIJ50BX120-40
The AirTAC Airtac SAIJ50 Adjustable Cylinder SAIJ50BX120-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø50mm bore and 120mm stroke, G1/4 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ50 mm
- Stroke120 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- CushionAdjustable, 30 mm
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SAIJ50 Adjustable Cylinder SAIJ50BX120-40
The AirTAC SAIJ50X120-40 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to dial back the nominal 120 mm stroke by up to 40 mm. This creates a usable travel window of 80 to 120 mm, providing exact end-position tuning at commissioning without swapping the hardware or adding external stops. In the 50 mm bore class, it generates 982 N of push thrust at 0.5 MPa, making it well-suited for moderate-force positioning tasks.
This unit is built with a SUS304 stainless steel rod for enhanced corrosion resistance and uses PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides, and while this specific SKU lacks a magnet, adding a -S magnet enables compatibility with AirTAC CMSE reed and DMSE electronic sensors. The rear adjuster acts purely as a travel stop for deceleration and does not hold the load without live air pressure.
Airtac SAIJ50 Adjustable Cylinder SAIJ50BX120-40 Technical Specifications
| Model | Airtac SAIJ50 Adjustable Cylinder SAIJ50BX120-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø50 mm |
| Stroke | 120 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M16×1.5 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Adjustable, 30 mm |
| Max stroke | Up to 1200 mm |
Specifications follow the official AirTAC SAI series datasheet and ISO 15552 dimensions. Confirm against the product label before installation. Port options: G (BSPP) / NPT.
Theoretical Output Force (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ50 Adjustable Cylinder SAIJ50BX120-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×120 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Related SAI-family variants: SAID (double rod), SAIJ (adjustable stroke), SAIL (with lock), SAIF (with valve), BSAI (enclasp / clamp-lock), and SAI-S with built-in magnet. Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B); seals: TPU (blank) / Viton H / NBR N.
Where the Airtac SAIJ50 Adjustable Cylinder SAIJ50BX120-40 Is Used
Machine Commissioning
Fine-tune the 80 to 120 mm travel window during initial setup to dial in exact end positions without machining external stopper blocks.
Product Changeover
Quickly adjust the retract stop on packaging lines when switching between different package sizes, saving downtime on the factory floor.
Variable End-Stop Positioning
Use the rear adjuster to set precise deceleration points for repetitive assembly tasks requiring moderate thrust up to 982 N.
Is the Airtac SAIJ50 Adjustable Cylinder SAIJ50BX120-40 the Right Cylinder?
Choose this 50 mm bore model when an application requires a variable end-stop within an 80 to 120 mm travel window, offering a distinct setup advantage over a fixed-stroke SAI cylinder during product changeovers. If your process needs less force, stepping down to a 40 mm bore yields 628 N of push thrust at 0.5 MPa. For higher loads, a 63 mm bore provides 1559 N.
When replacing an ISO 15552 cylinder, match the 50 mm bore, 120 mm stroke, 40 mm adjustment range, PT port threads, and the desired mounting style (Basic, FA, LB, TC, FTC, TCM1, or TCM2). Because the stroke is 120 mm, ensure proper guiding to prevent side-load wear on the rod. For load-holding without live pressure, select a SAIL or BSAI cylinder instead, as the SAIJ adjuster is not a lock.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
- ✓ Side load — consider a guided cylinder
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Avoid side load on the piston rod.
- check Adjust end cushion screws for smooth stops.
- check Use correct mounting accessory (FA/FB/CA/CB/LB/TC).
- check Installation by qualified personnel per AirTAC docs.
Airtac SAIJ50 Adjustable Cylinder SAIJ50BX120-40 FAQ
At 0.5 MPa operating pressure, this 50 mm bore cylinder provides 982 N of push thrust and 825 N of pull thrust. At the maximum pressure of 1.0 MPa, it delivers up to 200 kgf.
The rear adjuster screw allows you to shorten the effective travel from its 120 mm nominal stroke by up to 40 mm, creating an 80 to 120 mm usable window. It functions as a travel stop for end-position tuning and does not lock the load without continuous air pressure.
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